855773644-LEED-v5-BD-C-Reference-Guide-Launch-Edition - Page 176

Extracted Content

Process	Requirement
	OR Provide thermal recovery heat exchanger that cools drained discharge water below code-required maximum discharge temperatures while simultaneously preheating inlet makeup water. OR If fluid is steam condensate, return it to boiler.
Venturi-type flow-through vacuum generators or aspirators	Use no device that generates vacuum by means of water flow through device into drain.

AND

Minimum Outdoor Water Efficiency

OPTION 1. NO IRRIGATION

Show that the landscape does not require a permanent irrigation system beyond a maximum two-year establishment period.

OR

OPTION 2. EFFICIENT IRRIGATION

Reduce the project’s irrigation water requirement by at least 30% from the calculated baseline for the site’s annual theoretical irrigation requirement (TIR). Reductions must be achieved through plant species selection and irrigation system efficiency, as calculated by the TIR methodology outlined by the U.S. Environmental Protection Agency.

REQUIREMENTS EXPLAINED

The prerequisite sets minimum water efficiency requirements for fixtures, fittings, appliances, process water, and irrigation systems. There are two compliance options for fixture and fitting efficiency and two for outdoor water use efficiency.

Minimum Fixture and Fitting Efficiency

Reducing potable water use for fixtures and fittings begins with conservation efforts. Selecting high-efficiency fixtures reduces both water consumption and demand. This can lead to savings from reductions in pump energy and water heating requirements. For example, selecting highefficiency fixtures for lavatories, faucets, and showerheads reduces the electric load required for water heating.

U.S. Green Building Council LEED v5 Reference Guide for Building Design and Construction, April 2025 Launch Edition 166